What is the purpose of the Hartford loop?

Clark Crigger asked, updated on July 13th, 2022; Topic: hartford loop
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The Hartford loop is needed to prevent steam pressure in the condensate return line from forcing the liquid condensate (water) out of the boiler and back into the return piping system - something that could be a serious problem resulting in boiler water loss and boiler damage or destruction.

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And, do all boilers need a Hartford loop?

If the system has a dry return (as most one-pipe steam system do) you still need a Hartford Loop. ... There are no return pipes below the boiler water line, so there's no danger of losing the boiler water should an above-the-water-line return pipe break.

Whatever the case, what is a Hartford loop for a pool heater? The Hartford loop is a loop of air pipe (PVC) that rises from the air line above the highest possible water line of the spa by between 1" to 4" and then returns to the air line (see picture), this creates an air trap to stop water travelling along the air line.

On another note, how does the boiler loop work?

The boiler filling loop is a small braided hose with a valve attached. It can be found inside your boiler, and its purpose is to allow you to add additional water to the heating system. Because the volume of your system is fixed, adding more water increases the pressure.

What is a loop on a boiler?

A boiler filling loop is a pipe that is used to connect the central heating system to the mains water supply. Filling loops are used to recharge the water pressure in the central heating system if the boiler pressure gets too low.

27 Related Questions Answered

How does a steam loop work?

The Hartford Loop connects to the equalizer with a close nipple because steam rises up through the equalizer, just as it does through the boiler sections. When the relatively cool return water meets that steam at the close nipple, the rising steam bubbles quickly condense.

How do you pipe a residential steam boiler?

What is a steam loop?

: an arrangement of pipes by which water of condensation can be returned to the boiler without a pump or injector as a result of condensation of boiler steam in a loop of two vertical pipes connected by a horizontal one.

How many psi should boiler have?

In most cases, it should rise to about 20 psi while its heating element operates. That's optimal at normal temperatures. Pressure changes of a few psi one way or the other can be brought about by atmospheric conditions. Most boilers are safe up to around 30 psi, at which point seals can begin to fail.

What is a Hartford return connection?

Simply speaking, a Hartford Loop is a configuration of interconnected pipes associated with the gravity condensate return line on a steam boiler, and the point at which that condensation is re-introduced back into the boiler. It exists between the header of the boiler and the gravity return.

What is an equalizer pipe?

Equalizer pipe means a pipe from below the water level in a swimming pool or spa to the body of a skimmer which is designed to automatically prevent air from being drawn into the pump when the water level drops below the skimmer inlet.

Which pipe is the lowest pipe in parallel flow gravity return system?

If you have a gravity-return system the lowest, horizontal, steam-carrying pipe has to be a minimum distance above the boiler. In one-pipe steam, that distance is 28 inches. In two-pipe, gravity-return steam, you need a minimum of 30 inches for every pound of pressure in the boiler.

How do I know if filling loop is closed?

Filling loops can come in different designs and can be detached from the boiler when not in use. With the black levers in this position the valves are OFF/CLOSED. Find the filling loop and check that both ends are securely attached.

How does automatic filling loop work?

The Watts auto filling loop will refill a pressurised heating system when there is a drop in system pressure and maintains a full system. All heating systems can experience pressure drop due to a number of reasons like leakage, air within the system or even people bleeding radiators.

How do you close the filling loop on a boiler?

If the pressure is too low or keeps dropping, repressurising your boiler and central heating system is very easy:
  • Firstly, identify the pressure gauge on your boiler. ...
  • Open the valve or valves on the filling loop. ...
  • When the needle indicates the target pressure, close the filling loop.
  • How do you replace a filling loop on a boiler?

    Where does a filling loop go?

    Where should the filling loop be installed? The filling loop is installed between the mains cold water supply inlet and the central heating return pipe in the boiler and HIU.

    How many loops are present in steam?

    Steam Generation The most common power plants in the world use pressurized water reactors, which use two loops of circling water to produce steam. The first loop carries extremely hot liquid water to a heat exchanger, where water at a lower pressure is circulated.

    What is a wet return on a steam boiler?

    : a pipeline in a steam heating system for returning water of condensation to the boiler that being located below the waterline of the boiler can contain only water rather than the steam mixed with water which a return pipe located above the waterline may contain.

    What is the function of blowdown valve?

    Blowdown valves are commonly used to control the concentration of dissolved solids in the boiler water. The valves are designed and manufactured according to the requirements of the boiler and the industrial application.

    What type of pipe is used for steam boiler?

    Pipes for steam systems are commonly manufactured from carbon steel ASTM A106. The same material may be used for condensate lines, although copper tubing is preferred in some industries.

    How do you pipe a boiler?

    How do you hook up a steam boiler?

    The Boiler Startup
  • Check all valves and place in their startup position.
  • Open the sight gauge and water column high- and low-water shut-off valves. ...
  • Close the bottom blowdown valves, then open the upper drum vent valves.
  • Start filling with soft water.
  • What is a steam system?

    In steam heating systems, a boiler furnace heats water by means of a gas or oil-fired burner and turns it into steam. The steam travels through pipes to radiators or convectors, which give off heat and warm the room. As the steam cools, it condenses back into water, and returns to the boiler to be heated again.

    Why is steam so useful?

    Steam is efficient and economic to generate. Water is plentiful and inexpensive. It is non-hazardous to health and environmentally sound. In its gaseous form, it is a safe and efficient energy carrier.

    Is 2 too high for boiler pressure?

    What Boiler Pressure Is β€œToo High”? Anything above a boiler pressure of 1.5 bar isn't ideal. 2 bar starts to become more serious and when most boilers hit 3 bar, they're in the red zone on the pressure gauge. So, the unit is likely to lock out and display a fault code.

    Why is it called a boiler?

    How this drink came to be named after the workers who build and repair boilers is unknown. The Oxford English Dictionary, widely regarded as the foremost authority on word origins, says the term "boilermaker" was first used to refer to the craftsmen who built and maintained steam locomotives in 1834.

    What is the minimum dimension to the lowest steam carrying pipe from the boiler water line?

    So the lowest steam carrying pipe in the system must be at least 28 inches above the boiler water line. This dimension is called Dimension A. 3.

    What is the purpose of equalizing line?

    A pipe or tubing interconnection between two closed vessels, containers, or process systems to allow pressure equalization. Improper equalizing line sizing on multiple towers piped in parallel can cause unbalanced water flow through the tower.

    What is an equalizer culvert?

    An equalizer is a culvert placed to keep water on both sides of a fill at equal levels. This balances the water head on either side of an embankment and reduces seepage flow. They can also be used to equalize water bodies on either side of a road to prevent overflow and allow traffic to pass over.

    What is an equalizer in cooling tower?

    An external equalizer is a piped connection, specifically sized to maintain equal water levels between multiple cells or multiple units for an open cooling tower system. Equalizers must be used when two or more cooling towers are piped with a common header.

    Where should an air vent be installed on a one pipe steam heating system?

    The radiator's air valve, or radiator air vent or steam valve as it is sometimes called, is used only in one-pipe steam boiler systems. It is usually located at the end of the radiator opposite the supply pipe, about halfway up or higher towards the top.